Didn't you read Hebrews 11:8?
You have to have obedience and faith. Abraham obeyed God or his faith would have been dead. His faith was even tested when God told him to sacrifice Isaac.
Gen 15:6 And he believed the LORD, and he counted it to him as righteousness.
in Abram's 1st covenant believing God was what made Abram righteous
no getting around that
Abraham's 2nd covenant had works
Gen 17:10 This is my covenant, which you shall keep, between me and you and your offspring after you: Every male among you shall be circumcised
Paul's Mid Acts Dispensation
Rom_2:13 For it is not the hearers of the law who are righteous before God, but the doers of the law who will be justified.
Rom_2:23 You who boast in the law dishonor God by breaking the law.
Rom_3:20 For by works of the law no human being will be justified in his sight, since through the law comes knowledge of sin.
Rom_3:28 For we hold that one is justified by faith apart from works of the law.
Rom_4:13 For the promise to Abraham and his offspring that he would be heir of the world did not come through the law but through the righteousness of faith.
Rom 4:14 For if it is the adherents of the law who are to be the heirs, faith is null and the promise is void.
Rom 4:15 For the law brings wrath, but where there is no law there is no transgression.
Rom 4:16 That is why it depends on faith, in order that the promise may rest on grace and be guaranteed to all his offspring—not only to the adherent of the law but also to the one who shares the faith of Abraham, who is the father of us all,
Rom 4:17 as it is written, "I have made you the father of many nations"—in the presence of the God in whom he believed, who gives life to the dead and calls into existence the things that do not exist.